Football helmet



FIG. 1 is a front perspective view of a football helmet showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof, the opposite side being a mirror image; and,

FIG. 4 is a top view thereof.

The details shown in broken lines form no part of the claimed design. 

CLAIM We claim the ornamental design for a football helmet, as shown and described. 